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etName_firestore_update.text.append(personExtra.name)
etEmail_firestore_update.text.append(personExtra.email)
etPhone_firestore_update.text.append(personExtra.phone)

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val person = Person(
                null,
                etName_firestore_update.text.toString(),
                etEmail_firestore_update.text.toString(),
                etPhone_firestore_update.text.toString())

db.collection("Person").document(personExtra.id!!).set(person)
                .addOnSuccessListener {
                    "Updated Successful.".toast(this@UpdateFirestoreActivity)
                    finish()

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db.collection("Person").document(personExtra.id!!)

                .update("name",etName_firestore_update.text)
                    
                .addOnSuccessListener {
                    "Updated Successful.".toast(this@UpdateFirestoreActivity)
                    finish()
                    startActivity(Intent(this, FirestoreListActivity::class.java))
                    progressBarStyle.visibility = ProgressBar.INVISIBLE
                }.addOnFailureListener { exception ->

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView

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<style name="AppTheme" parent="Theme.AppCompat.DayNight">

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<style name="AppTheme" parent="Theme.MaterialComponents.DayNight">

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private fun chooseThemeDialog() {

        val builder = AlertDialog.Builder(this)
        builder.setTitle(getString(R.string.choose_theme_text))
        val styles = arrayOf("Light","Dark","System default")
        val checkedItem = 0

        builder.setSingleChoiceItems(styles, checkedItem) { dialog, which ->

      

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  private fun chooseThemeDialog() {

        val builder = AlertDialog.Builder(this)
        builder.setTitle(getString(R.string.choose_theme_text))
        val styles = arrayOf("Light","Dark","System default")
        val checkedItem = 0

        builder.setSingleChoiceItems(styles, checkedItem) { dialog, which ->

            when (which) {

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implementation "androidx.preference:preference-ktx:1.1.1"

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class MyPreferences(context: Context?) {

    companion object {
        private const val DARK_STATUS = "io.github.manuelernesto.DARK_STATUS"
    }

    private val preferences = PreferenceManager.getDefaultSharedPreferences(context)

    var darkMode = preferences.getInt(DARK_STATUS, 0)
        set(value) = preferences.edit().putInt(DARK_STATUS, value).apply()